Enable Net 7 and Net 8 style rules.

OpenRA.Game/Primitives/SegmentStream.cs

@@ -32,8 +32,7 @@ namespace OpenRA.Primitives
 		/// <param name="count">The length of the segment.</param>
 		public SegmentStream(Stream stream, long offset, long count)
 		{
-			if (stream == null)
-				throw new ArgumentNullException(nameof(stream));
+			ArgumentNullException.ThrowIfNull(stream);
 			if (!stream.CanSeek)
 				throw new ArgumentException("stream must be seekable.", nameof(stream));
 			if (offset < 0)